For terminal, the first thing I install is Midnight Commander - dual pane file manager. midnight-commander.org
For all of my physical Linux machines - Cockpit and Cockpit-File Sharing plugin.
Desktop
Thunderbird
Firefox
Vivaldi
Gnome
Chromium I use Firefox, wife uses Chromium and My WFH job I use Chrome. Vivaldi is a backup browser, I’ve been messing around with.
QEMU/LibVirtd - So I can run a Windows VM for my old Canon Lide 60 scanner which scans clearly there, otherwise in Linux, it’s contrasted super grey for some reason.
Kopia-UI - Backup system which supports NFS Shares - set and forget type of setup.
VLC - Need I say more? Lol
OnlyOffice - Better aesthetically IMHO than LibreOffice
PDF Arranger - Works well to re-arrange pages or rotate them after scanning them in. (I self host Sterling PDF and will probably switch to that later)